Hi,
Try this:
set.seed(5)
list1<-lapply(1:3,function(i)
data.frame(col1=sample(c(1:5,""),10,replace=TRUE),
value=rnorm(10),stringsAsFactors=FALSE))
res<-lapply(list1,function(x) {x[apply(x,2,function(y) y=="")]<-NA;x})
res[[1]]
# col1 value
#1 2 -0.6029080
#2 5 -0.4721664
#3 <NA> -0.6353713
#4 2 -0.2857736
#5 1 0.1381082
#6 5 1.2276303
#7 4 -0.8017795
#8 5 -1.0803926
#9 <NA> -0.1575344
#10 1 -1.0717600
A.K.
----- Original Message -----
From: Dominic Roye <dominic.r...@gmail.com>
To: R help <r-help@r-project.org>
Cc:
Sent: Tuesday, January 8, 2013 7:16 AM
Subject: [R] Logical operator and lists
Hello R-Helpers,
I have a slight problem with the expresion data[data==""] <- NA which works
well for a data.frame. But now i must use the same for a list of
data.frames.
My idea is data[[]][data==""] but it don´t work.
Thanks!!
Dominic
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